Highly thermally stable all-polymer solar cells enabled by photo-crosslinkable bromine-functionalized polymer donors

Modifying polymer PM6 by incorporating a third component for an enhanced short-circuit current density

“…In our previous work, we found that increasing the amount of the D (BDT-T) unit would weaken the push-pull interaction of the D-A unit and reduce the degree of crystalline behaviour, which is advantageous for the complementary absorption and miscibility of the crystalline acceptors. Herein, we report D-A-type random bi-polymers (PBDT a -TPD b ) 47 and D-D 1 -D-A type terpolymers (PBDT(T)FTAZ-B n ) 48 with obviously enhanced J SC and PCE values by simply tuning the D-A molar ratio. Very recently, non-equivalent D-A copolymer donors (PM6-Dn) with an enhanced performance were reported by Li's group, indicating that increasing the D-A molar ratio is an effective strategy resulting in random copolymerization.…”

Efficient charge generation and low open circuit voltage loss enable a PCE of 10.3% in small molecule donor and polymer acceptor organic solar cells

“…Organic solar cells (OSCs) based on polymer acceptors attract considerable attention for potential commercial application because of their superior thermal and light stability, and excellent efficiency. 1–11 The energy loss for the polymer acceptor could also be as low as 0.47 eV. 6,8 Importantly, the polymer acceptor could be easily polymerized from the small acceptors, and their opto-electrical properties could be well tuned through the monomer or ternary copolymerization.…”

Improved Stability of All-Polymer Solar Cells Using Crosslinkable Donor and Acceptor Polymers Bearing Vinyl Moieties in the Side-Chains

“…In addition, another study fabricated an active layer using a crosslinkable thieno­[3,4- c ]­pyrrole-4,6-dione­(TPD) donor polymer and IT-4F acceptor, and the corresponding PSC with this active layer achieved a PCE of 12.18% . Ling et al fabricated all-PSCs using a blend film of a 4,7-bis­(thiophen-2-yl)­benzo­[ c ]­[1,2,5]­thiadiazole-based crosslinkable donor and N2200 acceptor polymer. The PSCs bearing the crosslinked active layer achieved a PCE of 7.21% of and exhibited excellent thermal stability …”

“…Ling et al fabricated all-PSCs using a blend film of a 4,7-bis­(thiophen-2-yl)­benzo­[ c ]­[1,2,5]­thiadiazole-based crosslinkable donor and N2200 acceptor polymer. The PSCs bearing the crosslinked active layer achieved a PCE of 7.21% of and exhibited excellent thermal stability …”

“…The PSCs bearing the crosslinked active layer achieved a PCE of 7.21% of and exhibited excellent thermal stability. 34 Thus, in most of the previous studies, the active layers were prepared by mixing PCBM or NFAs with a crosslinkable polymer donor, after which the active layer was applied to PSCs. Although it is well known that crosslinking is effective for stabilizing the internal morphology of the active layer of PSCs, very few detailed studies have been published on the effect of the crosslinked active layer formed by networking between polymers with polymer donors and acceptors on the overall performance and stability of the PSCs.…”